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Goodman gas furnace code b1: Lost communication with the circulator blower motor
Gas furnace, Canada and United States
The control board has lost communication with the circulator blower motor, and the furnace does not operate.
This needs a licensed gas technician. There is nothing safe to check yourself. Leave the covers on and book a professional.
What causes it
-
Loose wiring at the blower motor control leads.
-
The circulator blower motor has failed.
-
The control board has failed.
How to read this code on your unit
The code shows on the two-character display on the furnace control board, which you can see through the sight glass on the blower compartment. On means normal operation. A blank display means the board has no power or has failed. A ComfortNet thermostat, if fitted, shows the same codes with a short message and uses EE for an internal fault.
Booking a licensed gas technician
Book a licensed gas technicianlicensed gas technician
- Turn the unit off and leave the covers on. Gas components must only be serviced by a licensed technician.
- Note the code, how often it appears, and the model and serial numbers from the rating label.
- Book a licensed gas technician and give them those details.
Models that show this code
66 models in 4 ranges
| Range | Models |
|---|---|
| GMVC8 / GCVC8 / AMVC8 / ACVC8 | GMVC80603BN, GMVC80603BX, GMVC80604BN, GMVC80604BX, GMVC80803BN, GMVC80803BX, GMVC80804CN, GMVC80804CX, GMVC80805CN, GMVC80805CX, GMVC80805DN, GMVC80805DX, GMVC81005CN, GMVC81005CX, AMVC80603BN, AMVC80603BX, AMVC80604BN, AMVC80604BX, AMVC80803BN, AMVC80803BX, AMVC80804CN, AMVC80804CX, AMVC80805CN, AMVC80805CX, AMVC80805DN, AMVC80805DX, AMVC81005CN, AMVC81005CX |
| GMVC96 / GCVC96 / AMVC96 / ACVC96 | GMVC960403BN, GMVC960603BN, GMVC960803BN, GMVC960804CN, GMVC961005CN, GMVC961005DN, GMVC961205DN, GCVC960403BN, GCVC960603BN, GCVC960804CN, GCVC961005CN, GCVC961205DN, AMVC960403BN, AMVC960603BN, AMVC960803BN, AMVC960804CN, AMVC961005CN, AMVC961005DN, AMVC961205DN, ACVC960403BN, ACVC960603BN, ACVC960804CN, ACVC961005CN, ACVC961205DN |
| GMVM96 / GCVM96 / AMVM96 / ACVM96 | GMVM960603BX, GMVM960805CX, GMVM961005DX, GMVM961155DX |
| GMVM97 / GCVM97 / AMVM97 / ACVM97 | GMVM970603BN, GMVM970803BN, GMVM970804CN, GMVM971005CN, GMVM971205DN, AMVM970603BN, AMVM970803BN, AMVM970804CN, AMVM971005CN, AMVM971205DN |
Where this comes from
- GMVC96/GCVC96 (revision AA) ComfortNet gas furnace installation instructions (IOG-2008H) , page 55
- GMVC8/GCVC8 ComfortNet gas furnace installation instructions (IOG-2012C) , page 44
- GMVM97/GCVM97 (revision AA) modulating gas furnace installation instructions (IOG-2007H) , page 56
- GMVM96/GCVM96 modulating gas furnace installation instructions (IO-406E) , page 55
Checked against the manufacturer's manual on 13 October 2026.
Other Goodman gas furnace codes
| Code | Meaning | What you can do |
|---|---|---|
| b0 | Circulator blower motor not running | Call a pro |
| b2 | Blower motor size does not match the shared data | Call a pro |
| b3 | Blower motor limiting its power, temperature or speed | You can often fix it |
| b4 | Blower motor tripped (lost rotor control or high current) | Safe checks first, then a pro |
| b5 | Blower motor fails to start (locked rotor) | Call a pro |
| b6 | Blower motor shut down for voltage or overheating | Call a pro |
| b7 | Blower motor lacks the data it needs to run | Call a pro |
| b9 | Low indoor airflow | You can often fix it |
| d0 | No shared data loaded on the control board | Call a pro |
| d4 | Invalid memory card data | Call a pro |
| Eb1 | Lost communication with the circulator blower motor | Call a pro |
| EbF | Inducer communication error | Call a pro |
See all communication fault codes on gas furnaces across brands.